HP AD510A HP StorageWorks 1500 Modular Smart Array Installation Guide (355901- - Page 31

Striping methods, RAID levels, stored on the array. For example

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Installation Procedures - All Deployments Striping methods A storage array combines the capacity of several physical hard drives into one virtual unit called an array. These arrays are then presented to the operating system as a single disk device. The physical layout of an array can be one of two configurations: ■ Vertical striping-Offers ultimate fault tolerance and performance, but at the price of storage efficiency. ■ Horizontal striping-Allows for the creation of large arrays and efficient use of storage capacity, but at the price of I/O performance and less fault tolerance. In a vertical configuration, an array uses hard drives from separate storage enclosures and different SCSI buses. In a horizontal configuration, the array uses multiple drives contained within the same storage enclosure. RAID levels In conjunction with the striping method, the assigned RAID level also determines the fault-tolerance, I/O performance, and storage efficiency of the LUN. See Table 3 on page 32 for a comparison list of the different RAID levels. When selecting a RAID level for a LUN, consider the type of data that will be stored on the array. For example: ■ For transitional data you may want to use RAID 0, which provides no fault tolerance, but provides rapid storage and access of large amounts of data. ■ For critical data use a fault-tolerant RAID level, such as RAID 1, RAID 1+0, RAID 5, or RAID 6. Choose the RAID level that offers the desired combination of fault-tolerance, I/O performance, and storage efficiency. Depending on the assigned RAID level, one or more drives within a LUN can fail without bringing the drive sub-system down. HP StorageWorks 1500 Modular Smart Array Installation Guide 31

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Installation Procedures - All Deployments
31
HP StorageWorks 1500 Modular Smart Array Installation Guide
Striping methods
A storage array combines the capacity of several physical hard drives into one
virtual unit called an array. These arrays are then presented to the operating
system as a single disk device. The physical layout of an array can be one of two
configurations:
■
Vertical striping—Offers ultimate fault tolerance and performance, but at the
price of storage efficiency.
■
Horizontal striping—Allows for the creation of large arrays and efficient use
of storage capacity, but at the price of I/O performance and less fault
tolerance.
In a vertical configuration, an array uses hard drives from separate storage
enclosures and different SCSI buses. In a horizontal configuration, the array uses
multiple drives contained within the same storage enclosure.
RAID levels
In conjunction with the striping method, the assigned RAID level also determines
the fault-tolerance, I/O performance, and storage efficiency of the LUN.
See
Table 3
on page 32 for a comparison list of the different RAID levels.
When selecting a RAID level for a LUN, consider the type of data that will be
stored on the array. For example:
■
For transitional data you may want to use RAID 0, which provides no fault
tolerance, but provides rapid storage and access of large amounts of data.
■
For critical data use a fault-tolerant RAID level, such as RAID 1, RAID 1+0,
RAID 5, or RAID 6. Choose the RAID level that offers the desired
combination of fault-tolerance, I/O performance, and storage efficiency.
Depending on the assigned RAID level, one or more drives within a LUN can fail
without bringing the drive sub-system down.